3 A molecular sieve in acetonitrile electrochemical synthesis: one compartment, three-electrode, air-tight cell, woven carbon anode and Ni foam catode, 0.2 M LiBF4 as supporting electrolyte, constant potential 1.50 V (vs standard calomel reference electrode); Yield given. Yields of byproduct given. Title compound not separated from byproducts;

trimethylsilyl trifluoromethanesulfonate; 4 A molecular sieve in diethyl ether T=0°C; 0.25 h; further thioglycoside; various benzene sulfenates; solvent, temperature and reaction time varied; Product distribution;

trifluorormethanesulfonic acid in dichloromethane T=-35°C; 1 h; Product distribution; Further Variations:Temperaturesreagent ratio;

1: N-bromosuccinmide; water / acetone / 3 h / 20 °C 2: acetic anhydride; dimethyl sulfoxide / 12 h / 30 °C View Scheme

Ledwith–Weitz salt in acetonitrile 8 h;

tetrafluoroboric acid; IPy2BF4 in dichloromethane T=-40°C;